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Digi m10 Technical Overview
3.11 Alternate Terminating Address (ATA) /
Message Forwarding
Message forwarding allows copies of all SC-terminated messages to be sent to an alternate
terminating address (ATA). Any valid e-mail address can be set as the ATA, and any of three
forwarding rules can be applied: carbon copy, conditional, or unconditional. The appropriate
address and rule should be specified when the satellite modem is provisioned.
3.12 Delivery Plan
A delivery plan is the scheme the ORBCOMM gateway uses to attempt delivery of SC-terminated
messages. Delivery plans have four main characteristics:
Automatic delivery attempts : the number of times, immediately upon receipt and at one-
minute intervals, the ORBCOMM Gateway will attempt to deliver an SC-terminated message
Time to hold : the maximum time the ORBCOMM Gateway will hold the message before
returning it as undeliverable
Deletion after final attempt : whether the message should be deleted after the automatic
delivery attempts are exhausted, or held until the time to hold has been reached
Use of piggybacking : whether a message delivery attempt should be triggered by
successful delivery of another message in either direction
3.13 GES-to-Satellite Channels
The RF links that connect an ORBCOMM Gateway GES to an ORBCOMM satellite use a single
57.6-kbps uplink and downlink channel that uses the TDMA protocol. This protocol permits
simultaneous RF links between a single satellite and several GES installations within the satellite
footprint. It also provides a virtually seamless hand-over of a satellite from GES to GES under the
centralized control of the GMSS.
3.14 GES-to-GCC Channels
GES-to-GCC links will operate over 56-kbps or 64-kbps data lines. A typical installation consists
of a Channel Service Unit/Data Service Unit (CSU/DSU) with a V.35 interface at both ends.
TCP/IP IEEE 802.3 (Ethernet) packet routers, which provide link layer internetworking, connect
these interfaces to the GCC and GES facilities. The GES process communicates with the GMSS
process using TCP/IP UDP packets.
Digi International, Inc. ? 2009
Page 16 of 24
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